INT 62 - FGDRIVER v4.02 - "FG_SETHPAGE" - SET HIDDEN VIDEO PAGE
AX = 00AEh
BX = new hidden page (0000h to 003Fh)
Notes: the FGDRIVER functions are rearranged with each major release, but
their parameters do not change (see #03474 at AX=0000h)
The specified page must be a physical page or a virtual page
SeeAlso: AX=0043h,AX=00B2h,AX=00B6h